Ninety degree dial indicator



NINETY DEGREE DIAL INDICATOR Filed June 29, 1934 lllllflllllllif f3nnentor5 Erik H/Meborqh.

Patented Oct. 1, 1935 UNHT ED STATES PATENT OFFlfiE NINETY DEGREE DIALINDICATOR of New York Application June 29, 1934, Serial No. 732,978

3 Claims.

This invention relates to a dial indicator of that class which is knownas a 90 degree indicator in which the contact plunger is mounted atright angles to the indicator operating plunger, and

which is sometimes called an angle indicator, and the present inventionis an improvement over that shown, described and claimed in UnitedStates Patent No. 1,891,196 issued on December, 1932 to Erik H.Aldeborgh and Christian E. Ruf.

In the above referred to patent the movement of the contact plunger istransmitted to the indicator operating plunger through a pivotedbellcrank, which construction required the contact plunger be mountedoff-set with respect to the instrument, which had many disadvantages, as

well as being costly to manufacture.

The object of the present invention is to construct a 90 degree dialindicator with the contact plunger concentric both with the dial and andthe back plate.

Another object of the invention is to construct an instrument of thiskind having few movable parts and those of rugged design, positive inoperation and of long wearing qualities.

Another object of the invention is to provide an instrument of this kindthat shall be readily assembled, be accurate and easily adjusted or itsparts renewed.

With these and other objects in view, our invention consists in certainnovel construction and combination of parts as will hereinafter be fullydescribed and claimed, and further illustrated in the accompanyingdrawing which forms a part hereof and in which like figures of referencerefer to corresponding parts in all of the views, and it is understoodthat slight changes may be made without departing from the spirit of theinvention.

In the drawing:

40 Figure 1 shows a side elevation of the dial indicator gage.

Figure 2 shows a rear view of the same.

Figure 3 shows an inside View of the back plate removed from the casing.

45 Figure 4 shows a partial vertical sectional view of the gage.

Figure 5 shows a partial sectional view of the rear of the casing,indicating plunger and anvil block.

50 Figure 6 is a vertical sectional view of the back plate, and apartial view of the indicating plunger and its rack and gear.

Referring to the drawing:

A dial indicator similar to that shown in Patent 55 No, 1,891,196 isindicated by the numeral l0, and

this is provided with a ring-shaped casing II which is formed with thetwo aligned bearings l2 and E3, the ends of which are closed by thethreaded plugs l4, and within which is slidably mounted the indicatingoperating plunger 15 5 which is provided with the rack teeth it in meshwith and designed to rotate the pinion ll which is mounted within thegear casing I8 and which through the usual train of gearing will rotatethe indicating hand over the dial of the indicator. 10

Secured to the ring casing II and to the gear casing 18 in a detachableand interchangeable manner by the screws I9 is the back plate 20, whichis formed with the boss 31 which supports the concentric stem 2| whichis designed to be 15 mounted in a tool holder, fixture or other meansfor supporting the instrument when in use.

This stem 2! is formed with an axial bore 22, having its upper endslightly countersunk as at 23 and communicating with a recess 24 whichis 20 formed in the boss 31 of the plate 2i as shown in Figure 3.

Within this bore 22 is slidably mounted the contact plunger 25 which isprovided with the head 26 which is mounted within the counter- 25 sunkportion 23 and the recess 24, while the lower end of the plunger 25projects beyond the lower end of the stem 2| and has thereon a collar 21which limits the inward movement of the plunger 25, and below saidcollar 21 is the contact point 30 28, which may be of some materialhardened and ground or be formed with a diamond point.

The indicating plunger l5 has secured thereon and partly within therecess 24 an anvil block 30 by the screw 3|, and this anvil block 39 isformed with a beveled face 32, having approximately a 45 degree angle asshown, and this face 32 is formed with a central groove 33, extendingfrom top to bottom thereof.

For imparting movement to the indicating 40 plunger l5 against theaction of the tension spring 34, which has one end attached to the rod35 and the other end attached to the casing l I, to operate the handthrough the movement of the contact plunger 25, there is placed withinthe recess 24 a hardened steel ball 35; said ball 36 being both incontact with the head 26 of the contact plunger 25, the end of therecess 24 and the beveled face 32 of the anvil block 30; the ball 36being in contact with the edges of the groove 33 which tends to keep theball 36 central with the indicating plunger 15 and the contact plunger25, thus eliminating any friction that would be caused should the ballcome into contact with the sides of the recess 24.

Thus through the ball 36, movement from the contact plunger 25 will betransmitted to the indicating plunger !5 without any lost motion betweenthe parts; the spring 34 normally retaining the ball 36 in contact withthe head 26, and the contact plunger 25 in its extended position.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent, is:

1. In a dial indicator of the class described, comprising in combinationwith a casing having an indicator operating plunger mechanism therein, aback plate for said casing and a contact plunger for operating saidindicating mechanism mounted within said back plate and extendingtherefrom, of means for imparting movement from the contact plunger tothe indicator operating plunger comprising an anvil attached to theindicating-operating plunger and a loose ball mounted in said back platebetween and in contact with said anvil and the plunger.

2. In a dial indicator of the class described, comprising in combinationwith a casing having an indicator operating plunger slidably mountedtherein, a back plate for said casing and attached thereto, of aconcentric stem formed on said back plate, a contact plunger slidablymounted therein and having a head within said back plate, said backplate formed with a radial recess in Within said recess in contact bothwith the head of the plunger, the face of the anvil and the end of therecess;

3. In a right angle dial indicator of the class described, thecombination with a casing having an indicator operating plunger slidablymounted therein, and a back plate for said casing detachably securedthereto, of a boss formed on said back plate, a stem formed on andextending from said boss in concentric relation with the' back plate andformed with an axial bearing therein, said boss formed with a radialrecess communicating with said axial bore, a contact plunger slidablymounted Within said bearing with its lower end extending from said stem,a

head on the upper end of said contact plunger and located within therecess, an anvil'formed with a grooved and beveled face and secured onsaid indicator operating plunger, and a ball mounted within said recessboth in contact with the end of said recess and with the beveled face ofthe anvil and the head of the contact plunger.

ERIK H. ALDEBORGH. ALFRED H. EMERY.

